BEIJING – China has 32 million more young men than young women — a gender gap that could lead to increasing crime — because parents facing strict birth limits abort female fetuses to have a son, a study released Friday said.

The imbalance is expected to steadily worsen among people of childbearing age over the next two decades and could trigger a slew of social problems, including a possible spike in crime by young men unable to find female partners, said an author of the report published in the BMJ, formerly known as the British Medical Journal.

"If you've got highly sexed young men, there is a concern that they will all get together and, with high levels of testosterone, there may be a real risk, that they will go out and commit crimes," said Therese Hesketh, a lecturer at the Centre for International Health and Development at University College London. She did not specify what kinds of crimes.